I was thinking about the same recently. how about a secret word that the other needs to know beforehand so they can identify me for real? like a password as identifyier for calls.

I was thinking one could always ask me: “But is Loki okay?” or “should I pick up Loki from Kindergarten?” or something - Loki is my belated cat and the answer would be a good indicator.

Or am I forgetting smt so this maybe wouldn’t work?